An American woman has been arrested in Zimbabwe for allegedly insulting President Robert Mugabe on Twitter. Martha O’Donovan is charged with subversion and insulting the president for allegedly calling Mr Mugabe a “sick man” in a tweet, according to the Associated Press. Ms O’Donovan is accused of tweeting “We are being led by a selfish man and sick man," and posting a photo suggesting Mr Mugabe is surviving on a catheter.